Analysis of periodical structures of woods

在“木材是从宏观到微观的各种周期性结构的集合，木材性质受周期性影响”的新思想下，研究了木材生产的环境因素和周期性的发生；细胞和组织排列的各向异性周期性；主要细胞壁成分的周期性分布；影响木材性质的介电、声学和视觉特性，并试图相互关联。周期分析的方法主要是通过傅里叶变换来实现的。结果表明，横切面上横纹和维管束分布的各向异性周期、切面上射线分布的各向异性以及纤维的三维形状和排列与木材的某些性质有关。建议纤维素微纤维在其横向上周期性取向，木质素的化学结构在一年中的沉积季节可能发生变化。

In the new idea that "Woods is the assembly of various periodical structures from macro- to micro-levels and the wood property is affected by the periodicity", following subjects; environmental factors for wood production and the occurrence of periodicities; anisotropical periodicities on the arrangement of cells and tissues; the periodical distribution of main cell wall componemts; dielectric, acoustic and visual characteristics affecting wood properties, were examined and attmpted to be related with one another. The method for the analysis of periodicities was mainly performed by the fourier transformation . As the results, anisotropic periodicities of trancheid and vassel distributions on the transverese section, of ray distribution on the tangential section and the three-dimensional shapes and arrangements of fibers could be caught and were related to some wood properties. Cellulose microfibrils are suggested to be orientating periodically on their cross direction and lignin may be changed in its chemical structure during the depositing season in a year.